Rejecting Mail

Messaging Server has a general purpose mechanism that you can use to
reject mail in accordance with a variety of criteria. This criteria includes
the message source or destination email addresses, as well as source IP address.
For example, you can use this mechanism to refuse mail from specific senders
or entire domains (such as mail from spam@public.com).
Should you have large lists of screening information, you can extend your
lists with a database that stores the access criteria. While not UBE-related,
this same access control mechanism is also suitable for maintaining a database
of internal users who are or are not allowed to send mail out certain channels.
For example, you can restrict on a per-user basis who can or cannot send or
receive Internet mail.